Previous year MCQs

UPPSC 2012 GS-1 General science
Question

Ultrasonics are sound waves of frequency:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Greater than 20, 000 Hz

Detailed Solution:

The correct answer is “Greater than 20, 000 Hz”.
Ultrasonic sound waves have frequencies above 20,000 hertz (Hz), or 20 kilohertz (kHz), which is the upper limit of human hearing.

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